HardLabs

Gemini

0xCB-dev·0xCB-Gemini·rev1.0/gemini.kicad_pcb

Gemini PCB layout, top view — open source RP2040/RP2350 board by 0xCB-dev
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About the Gemini PCB

Gemini is an open source RP2040/RP2350 PCB design by 0xCB-dev, published on GitHub under the Custom license license. It is a 4-layer board measuring 18 × 23.3 mm, with 50 components from 25 distinct parts.

Its main chip is the SC0914(13), from the RP2040/RP2350 family. Other key parts include the USBLC6-2P6, TLV75533PDQNR, W25Q128JVPIQ and SN74LVC1T45DRLR. By type, the board carries 20 capacitors, 16 resistors, 5 ICs, 2 transistors, 2 diodes and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

Helios features - waveshare zero compatible

Purchasing Gemini from any vendors listed here directly supports our work. Gemini controllers sourced from vendors not listed here and not produced by us will not receive the same level of support and may have varying degrees of quality.

- qmk clone - cd qmkfirmware - To go to bootloader press the reset button longer than 500ms and release. Alternatively you can short the RST pin to GND, as it's wired to the reset button. - make 0xcb/gemini:default:flash`

Gemini, from the project README
From the project README

Main components on the Gemini

USBLC6-2P6TLV75533PDQNRW25Q128JVPIQSC0914(13)SN74LVC1T45DRLR

Gemini bill of materials (BOM)

50 components, 25 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
USBLC6-2P6
U1
1
TLV75533PDQNR
U2
1
W25Q128JVPIQ
U3
1
SC0914(13)
RP2040
U4
1
SN74LVC1T45DRLR
74LVC1T45
U5
2
2N7002VC
2N7002VC-
Q1, Q2
1
ECS-120-10-36B-CWY-TR3
12MHz
Y1
1
USB4510-03-1-A
USB_C_Receptacle_USB2.0
J1
1
MF-FSMF050X-2
500mA
F1
1
EVP-BL2A1B000
SWITCH
SW1
1
PMEG2010BELD,315
PMEG2010BELD
D1
1
WS2812B-2020
WS2812B
Worldsemi
D2
1
BLM15PX601SN1D
600R
FB1
4
10uF 20% 10V 0402
10u
C1, C3, C4, C5
1
4.7uF 20% 10V 0402
4.7u
C2
10
100nF 10% 10V 0402
100n
C6, C11, C12, C13, C14, C15, C16, C17 +2
2
15pF 5% 10V
15p
C7, C8
2
1uF 20% 10V 0402
1u
C9, C10
1
CL05B104KO5NNNC
100n
Samsung Electro-Mechanics
C20
5
10k 1% 0402
10k
R1, R2, R3, R10, R16
Show 5 more
QtyPartRefs
3
51k 1% 0402
51k
R4, R5, R6
3
5.1k 1% 0402
5.1k
R7, R8, R15
2
1k 1% 0402
1k
R9, R13
2
27 1% 0402
27
R11, R12
1
0402WGF270JTCE
27R
UNI-ROYAL(Uniroyal Elec)
R14

Gemini design files

The KiCad project lives in the 0xCB-dev/0xCB-Gemini repository on GitHub; these links point at the commit this page was built from.

Gemini: common questions

What microcontroller does the Gemini use?

The Gemini is built around the SC0914(13), from the RP2040/RP2350 family.

How big is the Gemini PCB?

The Gemini measures 18 × 23.3 mm, has 4 copper layers and is 1 mm thick.

How many components are on the Gemini?

50 components, from 25 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Gemini design files?

From the 0xCB-dev/0xCB-Gemini repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Gemini design in my own project?

It is published under Custom license, which limits how it may be reused; read the license before building on it.

Can I test firmware for the Gemini without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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